thanks rogerzilla
the rim is being built in to the rear wheel of a lightweight off road kiddiback tandem running 2.4" wide tyres and disc brakes (so plenty of shock resistance but nothing to wear out). FWIW I suspect the rim to be an OEM E-bike rim so it should be decently strong
if it isnt up to the job it should show quite quickly I reckon, if that happens I will have to go to something like an MTX31